it gets samey. Boy, does it get samey.

For song accompaniment, yes that's a problem, particularly for the sort of singer who likes to shout like a Vogon and thrash the guitar like a gorilla at the same time. But for tune accompaniment, I'd say standard tuning gets boring a lot faster - all those stacks of thick porridgy thirds clogging up the texture. Hardly any guitarists using standard tuning for the backline seem to realize that you can get more variety by leaving notes out than by adding something extra you picked up in a jazz book.